CBL

I got a CBL unit and one of my students is working on some ideas for it. One of the first things that I assumed we could do is monior the temperature of a cup of coffee for a while and then do a regression to extract the ambient temperature. That doesn't seems to be quite as simple as I thought since the regression model A+ B C^t doesn't seem to be available on the TI-84. Or is it...?

Getting the motion sensor soon - there are lots of things that can be done with it.